16ga.com ~ View topic - Regarding psi proof rating and load selection

Member Joined: 01 Dec 2006 Posts: 524

If a gun is proofed to 13,000 psi for 1oz loads. Does that mean that its proofed to 13000 psi for any load? eg., 1 1/8oz at 8-10,000psi?

Proof pressure is not the same as service pressure:

**650 bars is standard CIP (British and European) pressure for shells designed for guns proofed at the CIP standard of 850 bars**
Per Larry Brown: "Per the master of the Birmingham Proofhouse, the problem with any psi/BAR conversion is that BAR still means crusher BAR, not Piezo BAR, to the Brits. Proof pressure is 13,920 psi; service pressure 10,730 psi. This is very close to equivalent to American standards before modern, 2 3/4" shells were introduced in the 1920's."
"CIP crusher service pressure for High Performance (magnum) is 900 bar service, proof 1200 bar; the transducer values are 1050 bar service, 1370 bar proof."

"Does that mean that its proofed to 13000 psi for any load? eg., 1 1/8oz at 8-10,000psi?" Yes, proofed at 13,000 psi for service pressure 8-10,000 psi.